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Abstract

We propose and demonstrate simultaneous amplitude regeneration for return-to-zero
phase shift keying (RZ-PSK) signals. Parallel 6$\,\times\,$40 Gb/s operation can be achieved
using the cross-phase modulation effect in a single saturated semiconductor
optical amplifier and subsequent narrow filtering. The spectrum of the distorted
signal can be broadened due to the phase modulation induced by the synchronous
optical clock signal. A narrow bandpass filter is utilized to extract part
of the broadened spectrum and remove the amplitude noise, while preserving
the phase information. Numerical simulation and experimental demonstration
show that the proposed scheme can work well for RZ-PSK signals with amplitude
noise. The bit error ratio measurements show that an average -1.3 dB power penalty can be achieved
for all the channels. Furthermore, the tolerance of the amplitude regeneration
is investigated.

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